COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES British Aerospace (Scottish Aviation) Twin Pioneer Series Aeroplanes AD/SA-TP/26 Amdt 1 Applicability: All models. Flap Operating System 1/87 Requirement: Action in accordance with Scottish Aviation TNS 50 issue 3. Compliance: Within 200 hours time in service after last compliance with the previous issue of this Directive prior to 31 January 1987 and thereafter every 200 hours time in service. Background: This amendment reflects the later issue of the TNS which extends compliance to 200 hours time in service.